Depends... what's an "import shop"?
If you want all the rice (underbody lighting, ridiculous shift knobs, HID kits, "new driver" stickers) there's only place for you:
http://www.yelp.com/biz/auto-freak-san-francisco
Along that same theme, if you want the latest issue of all the JDM car magazines, there's a bookstore in the same complex that has a wall of them:
http://www.yelp.com/biz/kinokuniya-bookstore-san-francisco
Apparently our local Honda tuner is in Hayward, though I've never been...
http://www.yelp.com/biz/dnr-performance-hayward
If that's not what you were looking for please ask again :smile: